In our study,we tackle a linear advection-diffusion equation that varies with time and is constrained to one dimension,under the framework of homogeneous Dirichlet boundary conditions.We employ two distinct approaches...In our study,we tackle a linear advection-diffusion equation that varies with time and is constrained to one dimension,under the framework of homogeneous Dirichlet boundary conditions.We employ two distinct approaches for solving this equation:an analytical solution through the method of separation of variables,and a numerical solution utilizing the finite difference method.The computational output includes three dimensional(3D)plots for solutions,focusing on pollutants such as Ammonia,Carbon monoxide,Carbon dioxide,and Sulphur dioxide.Concentrations,along with their respective diffusivities,are analyzed through 3D plots and actual calculations.To comprehend the diffusivity-concentration relationship for predicting pollutant movement in the air,the domain is divided into two halves.The study explores the behavior of pollutants with higher diffusivity entering regions with lower diffusivity,and vice versa,using 2D and 3D plots.This task is crucial for effective pollution control strategies,and safeguarding the environment and public health.展开更多
The crumpled graphene(CrG) was fabricated by applying defluorination of polyvinylidenefluoride(PVDF)on highly curved surface of CaC_2 particle through bottom-up synthetic strategy. The limited reaction depth between P...The crumpled graphene(CrG) was fabricated by applying defluorination of polyvinylidenefluoride(PVDF)on highly curved surface of CaC_2 particle through bottom-up synthetic strategy. The limited reaction depth between PVDF and CaC_2 leads to the formation of CrG with thin layer(3.6 layer graphene) and reasonable high specific surface area(~324.8 m^2 g^(-1)). CrG with N incorporation(N-CrG)was applied as electrode material for reducing oxygen(i.e.,oxygen reduction reaction, ORR) in alkaline, showing close onset potential to that of Pt/C and better mass-diffusion behavior. Surprisingly, with increased mass loading of catalysts,N-CrG exhibits steady current increase while Pt/C shows clear current plateau. Meanwhile, the N-CrG sample reveals high cycling stability and tolerance to contaminant,demonstrating its high potential for practical applications.Additionally, the bottom-up synthetic pathway to CrG via polymer dehalogenation on solid alkaline may find more applications which require controlled morphology and thickness of deposited thin graphitic carbon layers.展开更多
文摘In our study,we tackle a linear advection-diffusion equation that varies with time and is constrained to one dimension,under the framework of homogeneous Dirichlet boundary conditions.We employ two distinct approaches for solving this equation:an analytical solution through the method of separation of variables,and a numerical solution utilizing the finite difference method.The computational output includes three dimensional(3D)plots for solutions,focusing on pollutants such as Ammonia,Carbon monoxide,Carbon dioxide,and Sulphur dioxide.Concentrations,along with their respective diffusivities,are analyzed through 3D plots and actual calculations.To comprehend the diffusivity-concentration relationship for predicting pollutant movement in the air,the domain is divided into two halves.The study explores the behavior of pollutants with higher diffusivity entering regions with lower diffusivity,and vice versa,using 2D and 3D plots.This task is crucial for effective pollution control strategies,and safeguarding the environment and public health.
基金supported by the National Natural Science Foundation of Chinathe Program for Changjiang Scholars and Innovative Research Team in the Universitythe Fundamental Research Funds for the Central Universities
文摘The crumpled graphene(CrG) was fabricated by applying defluorination of polyvinylidenefluoride(PVDF)on highly curved surface of CaC_2 particle through bottom-up synthetic strategy. The limited reaction depth between PVDF and CaC_2 leads to the formation of CrG with thin layer(3.6 layer graphene) and reasonable high specific surface area(~324.8 m^2 g^(-1)). CrG with N incorporation(N-CrG)was applied as electrode material for reducing oxygen(i.e.,oxygen reduction reaction, ORR) in alkaline, showing close onset potential to that of Pt/C and better mass-diffusion behavior. Surprisingly, with increased mass loading of catalysts,N-CrG exhibits steady current increase while Pt/C shows clear current plateau. Meanwhile, the N-CrG sample reveals high cycling stability and tolerance to contaminant,demonstrating its high potential for practical applications.Additionally, the bottom-up synthetic pathway to CrG via polymer dehalogenation on solid alkaline may find more applications which require controlled morphology and thickness of deposited thin graphitic carbon layers.
